Kristian Ukkonen wrote:

Dale Randall wrote:
I have a variable speed dremel that fried the speed cotnrol and I by
passed the control after not being able to get replacement board, Then
I took a push button , on off light dimmer wall switch
and mounted it in shallow wall box . With a large round rubber heel
from old shoe made a foot operated swich that allows for speed control
also. Works good.

Pretty much the only part that can fail on
the control board is the surface mount
triac BT134W, which costs about 2usd..
I've replaced one to my dremel.. Pretty easy.

And the variable resistor.
It died on mine in such a way that the arcing has destroyed at least
the wiper, and possibly the resistive track too.
What should the end-end resistance of the track be?